I see no reason why Hugh Rowland and Alex Debogorski couldn’t drive over the ice roads to deliver drilling supplies to ANWR. BTW, as noted in the series, after the ice road season is over, the tundra beneath the ice roads are untouched because the roads simply melt away.
ANWR needs a pipeline and a pipeline needs a permanent access road. The access road would be built of gravel in the winter and thick enough that the permafrost underneath wouldn’t melt in the summer.